JPH1129918A - Dust collecting facility for draining system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collecting facility which can maintain high reliability and requires no human power by preventing a decrease in the draining performance of a draining system. SOLUTION: A dust collecting facility for a draining system includes a main channel gate 3 provided in the downstream portion of a main channel 1, a bypass channel 4 provided to branch off from the main channel 1 and having a draining pump, and a bypass channel gate 6 provided in the downstream portion of the bypass channel 4, and screens 122 which can trap dust and transfer it in the cross direction of the channels are placed near a branching part where the bypass channel 4 branches off from the main channel 1. A storage place 202 communicated with the upstream and downstream sides of the screens 122 is provided near the branching part or a pump water absorbing vessel, and a waterflow generating means capable of generating turning flow is placed inside the storage place 202 to prevent dust from flowing out from the storage place 202.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust removal system for a drainage system for draining river water by providing a bypass waterway in a river, and more particularly to a dust removal system for a drainage system for preventing dust from flowing into a pump.

[0002]

2. Description of the Related Art FIG. 8 is a layout plan view of a general drainage system of this kind in which a bypass channel is provided in a river and a drainage station is provided in the middle of the channel.

[0003] The drainage system shown in FIG. 8 has a main waterway at a connection between a river 1 (or a waterway, hereinafter the same) as a main waterway and a large river 2 (a large waterway or the ocean, hereinafter the same) connected downstream. The gate 3 is provided and the detour waterway 4 is opened. Then, a drainage station 5 equipped with a drainage pump is provided in the middle of the bypass waterway 4, and a bypass waterway gate 6 is provided at a connection between the bypass waterway 4 and the large river 2. In the event of a flood such as heavy rain or a typhoon, the main waterway gate 3 is closed and the detour waterway gate 6 is opened, and the turbid water of the river 1 is drained to the large river 2 by the drain pump installed at the drainage station 5, and the flooding of the river 1 basin is damaged. To prevent

Further, in this drainage system, dust is prevented to prevent dust from floating and flowing down the river 1 from flowing into the drainage station 5 from the bypass channel 4 and damaging or blocking the drainage pump to disable drainage operation. A dust removal facility 7 having a screen (usually a bar screen) for trapping water is disposed near a branch portion where the bypass channel 4 branches off from the river 1 or at an inlet of a drainage plant 5. The mesh width of the screen of the dust removal equipment 7 is set to a size not more than a size of dust that may impede rotation due to blockage of the impeller (or bite into a narrow portion of the pump) when the pump sucks, thereby making it impossible to operate. ing.

The garbage caught on the screen of the dust removal equipment 7 is usually collected at predetermined intervals, for example, in accordance with the Sewer Design Materials Study Group, “Sewerage Lecture 3-Design and Concept of Pump Stations” (April 1979). 5th edition, published by Kashima Shuppankai on May 96), page 96.

In this automatic dust remover, an endless chain equipped with several scrapers runs on a screen provided substantially vertically on the water surface, and scrapes and removes dust trapped on the front surface of the screen by the scrapers. It is. That is, when the scraper on the endless chain reaches a position where the scraper is inverted near the upper end of the screen, the dust falls from the scraper onto a belt conveyor installed below the position where the scraper is inverted. Then, the garbage is put on a belt conveyor, sent to a hopper, collected, and disposed of as industrial waste outside the drainage plant.

[0007]

SUMMARY OF THE INVENTION In the above-mentioned conventional structure,
The following issues exist. That is, in the prior art, the dust trapped on the screen is pressed against the screen by the flowing water pressure flowing down the bypass water channel 4. Therefore, in order to scrape and remove dust on the screen with a scraper as described above, it is necessary to scrape against the frictional force due to the pressing force, and the force may increase to several tons or more. Also, this friction force
In addition to the pressing force of running water, it depends on the coefficient of friction between the dust and the screen, but the dust has a wide variety of shapes, such as driftwood, mushrooms, and plastics, and in some cases, the coefficient of friction is very large .

Therefore, in these cases, the frictional force becomes extremely large, and the driving motor of the scraper is overloaded and trips, making it difficult to maintain good performance of the dust remover. If the performance of the dust remover decreases, dust accumulates on the screen of the dust removal facility and impedes water flow. Therefore, the water permeability of the bypass water passage decreases, and it becomes difficult to maintain the drainage performance of the drainage system.

Further, when the dust scraped up by the scraper falls on the belt conveyor, depending on the shape and material of the dust, the dust rebounds on the conveyor and falls off the conveyor. The conveyor is jammed due to being caught and cannot be transported.
In particular, oversized garbage such as home appliances tends to be in such a state. Also, in a hopper that stores dust transported by a conveyor, the dust is entangled with each other and forms a large lump, and does not fall down by being caught by a guide.
The hopper overflows. In such a case, the transport conveyor and the dust remover in the upstream process must be stopped. Thus, the steps are interrelated and, in particular,
If an obstacle occurs in the process from rake to the hopper,
The function as a dust removal facility is impaired.

[0010] Therefore, since this drainage system is operated in the event of an emergency of a typhoon or heavy rain to prevent flooding of a river, it is necessary to further enhance its reliability.

SUMMARY OF THE INVENTION An object of the present invention is to provide a drainage system for a drainage system which can prevent the drainage performance of the drainage system from deteriorating, maintain high reliability, and requires no manual operation.

[0012]

SUMMARY OF THE INVENTION An object of the present invention is to provide a main waterway gate provided at a downstream portion of a main waterway, a bypass waterway provided with a drainage pump branched from the main waterway, and a downstream of the bypass waterway. A drain screen provided in a drainage system provided with a bypass waterway gate provided in the section, a dust removal screen disposed near a branch portion where the bypass waterway branches from the main waterway or near a pump suction tank, and a pump is provided from the main waterway. In a dust removal system for a drainage system for preventing inflow of refuse, a storage area communicating with the upstream and downstream sides of the screen is arranged near the branch or near the pump suction tank, and a swirling flow is generated in the storage area. This is achieved by providing a doorway.

[0013] The above object is also achieved by providing a main waterway gate provided downstream of the main waterway, a bypass waterway provided with a drainage pump branched from the main waterway, and a downstream waterway of the bypass waterway. It is installed in a drainage system provided with a detour waterway gate, and has a dust removal screen arranged near a branch portion where the detour waterway branches off from the main waterway or near a pump suction tank, and prevents dust from flowing into the pump from the main waterway. In the dust removal equipment for a drainage system to prevent, a storage area communicating with the upstream side and the downstream side of the screen is provided near the branch or near the pump suction tank, and a water flow generating means for generating a swirling flow in the storage area is provided. Achieved by:

According to the above configuration, the garbage is carried by the water flow and sent into the storage yard, and the dead water stagnation portion surrounded by the swirling flow is secured on the way to the outlet of the storage yard. It will not be caught by the department and flow out of the storage site.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the entire structure of a dust removing apparatus 100 according to the present embodiment, and FIG. 2 shows a cross-sectional view taken along line XY of FIG.

In FIG. 1 and FIG.
Reference numeral 0 denotes a screen provided at the entrance of the bypass waterway 4 in the drainage system described above with reference to FIG. 8, that is, near the branch from the river 1, which is the main waterway, and capable of moving dust in the width direction of the bypass waterway. Yes, roughly, a plurality of weirs 101 having a vertically movable motor drive device 161
And a plurality of horizontal plate screens 122 located on the lower side of the upstream of the weir 101, and are arranged stepwise with respect to the width of the channel. Further, a weir is not provided at the most downstream end of the weir 101, and has an entrance through which a swirling flow can be generated in the storage yard in a state where the storage yard 202 is disposed deeply so as to surround the opening. Each structure and function will be described below.

First, the weir 101 will be described. Weir 10
1 is a water level detecting means 151 for detecting the water level of the upstream waterway.
The drive of the weir is controlled by an electric signal from the displacement detection means 161 for detecting the height position of the self and the control of the weir so that the underwater plunge depth becomes substantially constant. Block the surface flow.

Each weir 101 is, for example, a structure having an outer frame formed of a steel plate or the like. In particular, a weir body 101a having a smooth flat surface on the upstream side and a plurality of weirs provided at both ends thereof so as to be vertically movable. It comprises a guide roller 101b and a guide rail 101c (on the ground side), and moves up and down along the guide rail 101c so that the plunge depth can be controlled to follow the water level change. The guide rail 101c is provided with limit switches 101d and 101e so that the weir 101 does not rise too much to allow a gap between the upper end of the screen 122 and the lower end of the float. Lowers to the bottom of the water, and serves to cut off the drive motor input so that the drive motor is not overloaded.

Next, the screen 122 will be described.
The horizontal screen 122 is disposed over the entire width of the lower channel of the front surface (upstream side) of the weir main body 101 in order to trap dust 301 in the water flow, and includes a plurality of parallel plates 122a. Each plate 12
Reference numeral 2a denotes a plate having a width of several hundred mm or more with respect to the water flow direction so that string-like and thread-like dust is hardly entangled. Here, the mesh size of the horizontal screen 122 is set to be equal to or smaller than the size of garbage, which may be impeded from rotating due to blockage of the impeller (or biting into the narrow portion of the pump) when the pump sucks, thereby making it inoperable. ing. In addition, as shown in FIG. 1, the bypass waterway 4 is generally divided into a plurality (three in this embodiment) of bypass waterways 4A by a center pier 4a. Therefore, in the dust removal equipment 100 of this embodiment, for the convenience of construction, the weir main body 101 and the horizontal screen 122 are divided according to the size between the center piers 4a, and are divided and provided for each of the bypass waterways 4A. That is, each unit has three weirs 10 arranged so as to substantially divide the entire width of each detour water channel 4A into three.
One and three horizontal screens 122 are arranged in a stepwise manner.

In the vicinity of the downstream end of the water flow blocked by the weir 101 in the downflow direction, a storage site 2 opened upstream is provided.
02 is arranged.

Here, the capacity of the storage site 202 is previously set to be sufficient to store the amount of dust expected to flow down during a flood (if such an area cannot be secured, the above-mentioned automatic dust removal equipment is installed. May be). It has an entrance through which a swirling flow can be generated in the storage area, and forms a dead water accumulation section in the storage area 202, and plays a role of preventing dust stored in the storage area from flowing out.

The operation and effect of the dust removal equipment 100 of the present embodiment having the above-described configuration will be described below.

In a general drainage system provided with the dust removal equipment main body 100 (see FIG. 8), for example, when a flood such as heavy rain or a typhoon occurs, the main waterway gate 3 downstream of the river 1 is closed and a detour is performed. The detour channel 6 downstream of the channel 4 is opened, and the turbid water of the river 1 is
The water is discharged through the bypass water channel 4 by the drainage pump inside, thereby preventing flooding of the river basin. At this time, various kinds of dust such as a water carrier, wood, plastic, etc., flow down in the river 1 together with the turbid water. It flows down the surface. Then, together with the turbid water, an attempt is made to flow into the bypass waterway 4 from the river 1 at the branch of the bypass waterway 4. Here, in the dust removing equipment 100, a horizontal plate screen 122 is provided at the branch portion, and the movable weir 101 is set above the downstream side so as to block the surface flow. By this operation, the surface layer flow on the front surface (upstream side) of the weir main body 101a is reduced.
, And flows toward the storage area 202 as shown by the arrow in FIG. Therefore, all the refuse flowing down the surface is sent to the storage site along this stream.

On the other hand, dust that has flown in the water or the bottom of the water is captured by the horizontal screen 122. This dust can be removed as follows. That is, the weir 101
Is operated to close the middle and lower layers, as in the surface layer flow, the direction changes to a direction toward the storage site, and the lateral force of the horizontal screen 122 can be applied to the dust. Since the movable weir 101 and the horizontal screen are arranged in a step-like manner, the water flow toward the closed weir becomes a flow that flows down in one direction downstream immediately before the weir.

As described above, the dust is separated from the horizontal plate screen 122 and is caught by the horizontal plate screen 122 on the downstream side. Next, the second stage weir 101
Can be similarly sent out to the next horizontal plate screen 122 side. By sequentially performing such operations, dust that has flown in water or on the bottom of the water can be accumulated in the storage area 202.

Here, in order to secure the water passage area of the water channel as much as possible, after the weir 101 is closed, it is preferable to return to the state before the close of the weir before starting the closing operation of the next weir. . Such operation of removing dust from the horizontal screen 122 may be automatically performed at predetermined time intervals, or the water level detecting means 151 and the weir 10 may be used.
The water level difference is calculated from the water level detection means 152 on the downstream side of 1 and
This may be performed when the water level difference exceeds a predetermined value. These operations can be realized by an electronic control circuit incorporated in the control device 162 in advance.

It should be noted that since the depth of the weir for damping the surface flow into the water is not so large that a difference in water level may be made, it is preferable to set the depth as follows as a guide. This will be described with reference to FIGS.

When the weir stops the flow, a water level difference occurs before and after the weir. It is known that the water level difference (x) is uniquely determined by the penetration depth (y) below the water surface of the weir as shown in FIG. 9, and for example, hydraulics (edited by Honma et al., Iwanami Shoten) According to page 199, it is given by the relationship:

Y = Ho−Q / μb√ (2 gx) where Ho = water level upstream of the weir, Q = flow rate, μ = runoff coefficient (= 0.6), b = water channel width, g = gravitational acceleration is there.

FIG. 10 specifically shows this relationship. In this figure, the channel width b = 7 m and the amount of flowing water Q = 17.5.
m ³ / s (flow rate = 0.5 m / s), and the water depth Ho of the water channel is shown for two cases of Ho = 5 m and Ho = 3 m, respectively. (When Ho = 3m, Q
= 10.5 m ³ / s) As is clear from FIG. 10, it can be seen that the greater the penetration depth y of the float 101, the greater the difference in water level before and after the float 101. However, if the penetration depth y is too large, the weir 1
The water level Ho upstream of 01 is undesirably increased. Assuming that the water level difference is suppressed within 0.1 m, the penetration depth y of the weir 101 is y = 2.0 m and Ho = 5 m when Ho = 5 m.
Ho = 1.2 m in the case of 3 m. Therefore,
During the drainage operation, it is usually preferable to control the weir so that the plunge depth is less than this level.

When there is a difference in water level between the front and rear surfaces of the weir 101,
Since a water pressure corresponding to a water level difference acts on the weir 101, the weir main body 101a, the guide roller 101b, and the guide rail 101c need to be designed in advance so as to have strength enough to withstand this water pressure.

As described above, all the dust 301 that floats down the surface layer and the bottom layer can be accumulated in the storage 202, and is temporarily stored here. Here, the storage site 202 and the downstream side of the weir 101 communicate with each other, and a downstream water flow is created in the storage site by the operation of the drainage pump. Therefore, the water flow whose course has been changed by the weir 101 is discharged therefrom. .

Here, a description will be given of how the water flow in the storage site keeps the dust in the storage site. This will be described with reference to FIG. The storage area 202 has an entrance 202a,
A center pier 203 for partitioning 202c is arranged.
The flow including the dust flowing from the entrance 202a is separated when the tip of the center pier 203 is bent and flows down, and the dust moves to the innermost part of the storage area 202 without being able to turn around. In the innermost part, a dead water retention part is generated, and a swirling flow 202d as shown in the drawing is generated therein, and dust having a specific gravity smaller than 1 is accumulated at the center of the swirling flow by centripetal force.

As described above, the dust 301 is stored in the dead water retaining section 202e in the swirling flow.

Then, the stored refuse 301 is stored in the storage area 20 by a crane 210 with a bucket disposed so as to be movable in the front-rear, left-right, and up-down directions above the storage area 202.
2 and can be directly transferred to a transportation means such as a truck and taken out of the drainage station.

Preferably, the bottom of the reservoir 202 is set higher than the bottom of the bypass channel 4A (not shown), and at a normal water level, the bottom is constructed at a level where the bottom appears on the ground surface.
When the water level returns to the normal water level, a wheel loader, a shovel, or the like can directly enter the storage area 202 to collect dust. Therefore, it is possible to omit the step of pulling up the refuse from the water surface and moving the garbage to the hopper by the conveyor on the ground in the conventional equipment, thereby simplifying the equipment.

Also, preferably, by providing an openable / closable net 211 at the entrance / exit of the reservoir 202, the net 211 is closed at the end of the drainage operation, so that the refuse in the reservoir 202 flows out. Can be prevented.
Here, the opening and closing operation of the net 211 is performed by the electric winch 2.
12 can be performed.

Therefore, the dust removal equipment 1 according to the present embodiment
According to 00, not only the conventional method of scraping garbage trapped on a screen with a scraper, transporting the garbage by a conveyor, and collecting the garbage on a hopper, but also solving the problems of garbage transportation, as well as simplifying the operation without human intervention It is possible to provide an improved dust removing facility.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a plan view showing the entire structure of the dust removal equipment 100 according to the present embodiment, and FIG. 4 is a horizontal sectional view thereof. FIG. 6 is a plan view of the storage area 202. This embodiment is different from the first embodiment in that the movable weir 101 and the horizontal screen 122 for transferring garbage in the width direction of the waterway are arranged in the diagonal direction of the waterway width of the bypass channel 4, and the shape of the reservoir is circular. This is to make it easy to create a swirling flow by making it arc-shaped. The operation and effect are exactly the same as those of the first embodiment.
Further, in this embodiment, a swirling flow is forcibly generated by ejecting water taken by a pump 212 from a plurality of nozzles 214 as shown in FIG.

As described above, the shape of the storage field and the method of generating the swirling flow according to the present invention may take various forms in light of the gist of the present invention. It is obvious that all the generation of the swirling flow inside the storage area and the accumulation of dust in the storage area is included in the present invention.

[0041]

According to the present invention, it is possible to obtain a dust removal system for a drainage system which can reliably and reliably prevent a decrease in drainage performance of the drainage system with a simplified structure.

Thus, a dust removal equipment for a drainage system which can be reliably prevented can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line XY of FIG.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a sectional view taken along the line XY of FIG. 3;

FIG. 5 is a plan view of the first embodiment of the present invention.

FIG. 6 is a plan view of a second embodiment of the present invention.

FIG. 7 is a plan view of a second embodiment of the present invention.

FIG. 8 is an explanatory diagram of a conventional technique.

FIG. 9 is a diagram showing a dimensional relationship such as a water level difference x and a penetration depth y below the water surface of a weir.

FIG. 10 is a diagram illustrating an example of a relationship between a water depth H0 and a plunge depth y.

[Explanation of symbols]

1 ... drainage target river, 2 ... major river, 3 ... gate, 4 ... detour channel, 4a ... center pier, 5 ... drainage station, 6 ... gate,
7, 100: dust removal equipment, 8: pump water absorption tank, 101:
Weir, 101a ... weir body, 101b ... weir guide, 101c ...
Guide rollers, 101d, 101e ... limit switches,
122: horizontal screen, 122a: plate, 15
1, 152: water level detecting device, 161: weir driving device, 16
2: Displacement detecting means, 163: Control device, 202: Reservoir, 202a: Entrance, 202b: Inside of swirling flow, 202c
… Exit, 202d… swirling flow, 203… center pier, 21
0: Crane equipment with bucket, 211: Net, 21
2. Net open / close winch, 213 pump, 214 water supply pipe, 215 injection nozzle, 301 floating dust.

Claims (5)

[Claims] 1. A main waterway gate provided downstream of a main waterway, a bypass waterway provided with a drain pump branched from the main waterway, and a bypass waterway gate provided downstream of the main waterway. Drainage installed in a drainage system provided with a dust removal screen disposed near a branch portion where the bypass channel branches from the main channel or near a pump suction tank, and prevents inflow of dust from the main channel into the pump. In the system dust removing equipment, a storage area communicating with the upstream side and the downstream side of the screen is disposed near the branch portion or near the pump suction tank, and an entrance for generating a swirling flow is provided in the storage area. Dust removal equipment for drainage systems. 2. The dust removal equipment for a drainage system according to claim 1, wherein a bottom level of the storage site is higher than a bottom level of the bypass waterway. 3. The dust removing equipment for a drainage system according to claim 1, wherein a structure is provided in the vicinity of the upstream and downstream communication portions of the storage site for shutting off the bypass water channel and the storage site. Dust removal equipment for drainage system. 4. The dust removal equipment for a drainage system according to claim 1, further comprising a facility for pulling up the refuse in the storage place from above the storage place and carrying it out. 5. A main waterway gate provided at a downstream portion of the main waterway, a bypass waterway provided with a drainage pump branched from the main waterway, and a bypass waterway gate provided at a downstream portion of the bypass waterway. Drainage installed in a drainage system provided with a dust removal screen disposed near a branch portion where the bypass channel branches from the main channel or near a pump suction tank, and prevents inflow of dust from the main channel into the pump. In the system dust removing equipment, a storage area communicating with the upstream and downstream sides of the screen is provided near the branch or near the pump suction tank, and a water flow generating means for generating a swirling flow in the storage area is provided. Dust removal equipment for drainage systems.